The other day, my brother drove his car down the street at ________ I thought was a dangerous speed. 
#74018
A
as
B
which
C
what
D
That
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The experiment shows that proper amounts of exercise, if _____ regularly, can improve our health.
#67898
A
being carried out
B
carrying out
C
carried out
D
to carry out
All ___ can be done has been done.
#71593
A
what
B
that
C
which
D
the one
       , we could forgive him for his mistakes!
#70023
A
Were he still a child
B
If he is still a child
C
Did he realize he is wrong
D
He were still a child